Added remaining nullable annotations after merge.

src/Avalonia.Controls/TextBoxTextInputMethodClient.cs

@@ -9,8 +9,8 @@ namespace Avalonia.Controls
 {
     internal class TextBoxTextInputMethodClient : ITextInputMethodClient
     {
-        private InputElement _parent;
-        private TextPresenter _presenter;
+        private InputElement? _parent;
+        private TextPresenter? _presenter;
 
         public Rect CursorRectangle
         {
@@ -45,10 +45,10 @@ namespace Avalonia.Controls
         public string? TextBeforeCursor => null;
         public string? TextAfterCursor => null;
 
-        private void OnCaretBoundsChanged(object sender, EventArgs e) => CursorRectangleChanged?.Invoke(this, EventArgs.Empty);
+        private void OnCaretBoundsChanged(object? sender, EventArgs e) => CursorRectangleChanged?.Invoke(this, EventArgs.Empty);
 
 
-        public void SetPresenter(TextPresenter presenter, InputElement parent)
+        public void SetPresenter(TextPresenter? presenter, InputElement? parent)
         {
             _parent = parent;
 

src/Web/Avalonia.Web.Blazor/AvaloniaBlazorAppBuilder.cs

@@ -13,7 +13,7 @@ namespace Avalonia.Web.Blazor
 
         public AvaloniaBlazorAppBuilder()
             : base(new StandardRuntimePlatform(),
-                builder => StandardRuntimePlatformServices.Register(builder.ApplicationType.Assembly))
+                builder => StandardRuntimePlatformServices.Register(builder.ApplicationType!.Assembly))
         {
             UseWindowingSubsystem(BlazorWindowingPlatform.Register);
         }